It does, but still wouldn't Home have it's own language, being the extremely integrated and accepting place it is. Maybe the Creole exists, but only as the native language of Home, so it's widely spoken there, but only a few elite, cosmopolitian-minded citizens speak it otherwhere, kind of like English in India. So, it is a full-fledged language used for trade, but nowhere near approaching the widespread "every human peasant speaks this language" nature of Common in Generic D&D World.